According to a paper in 'Franciae Vexilla', a rank ensign for
the Chief of Staff of the Army was planned in Haiti in the 50's.
The source literally says 'was planned', probably assuming that
the ensign was not really in use.

image by Ivan Sache, 30 June 2001

In the book 'Flottes de Combats' (1950, p. 256), the ensign is
shown as a red flag with three white stars placed in a triangle
shifted to the upper hoist.

image by Ivan Sache, 30 June 2001

In the 1954 edition of 'Flottes de Combat' (p. 231), the flag
is still red but there is only a large star in the middle of it.